Device for crushing large molding sand pieces and for separating residual iron parts therefrom

ABSTRACT

A device for crushing large molding sand pieces and removing iron parts therefrom, according to which a cutting device, preferably in the form of crosswise arranged cutting edges, is interposed between feeding means for feeding the large molding sand pieces to be cut up and a receiving container for receiving the cut up molding sand, while only the cutting device is oscillated, a conveyor being associated with the outlet of the receiving container for receiving the molding sand from the receiving container, while magnets adjacent the conveyor are adapted to withdraw iron parts from the molding sand on the conveyor.

United States Patent n91 Grob A A 11 1 3,823,881 [451 July 16, 1974 DEVICE FOR CRUSHING LARGE MOLDING SAND PIECES AND FOR SEPARATING RESIDUAL IRON PARTS THEREFROM [75] Inventor: Konrad Grob, Siebnen, Switzerland [73] Assignee: Alfred Gutmann Gesellschaft fur Maschinenbau, Hamburg, Germany [22] Filed: May 25, 1972 [2]] Appl. No.: 256,957

[30] Foreign Application Priority Data May 27, 1971 Germany 2126284 [52] US. Cl....; 241/79.l, 241/94, 241/DIG. 10 [51] Int. Cl. B02c 19/20, B07b 13/00 [58] Field of Search. 241/79, 79.1, 83, 94, DIG. 10,

[ 56] References Cited UNITED STATES. PATENTS 1,987,192 l/l935 Huelsdonk 241/83 3,081,954 3/1963 Heckett 241/79] X 3,272,330 9/1966 Nelson 241/79.l X

Primary Examiner-Roy Lake Assistant Examiner-E. F. Desmond Attorney, Agent, or Firm-Walter Becker [57 ABSTRACT A device for crushing large molding sand pieces and removing iron parts therefrom, according to which a cutting device, preferably in the form of crosswise arranged cutting edges, is interposed between feeding means for feeding the large molding sand pieces to be cut up and a receiving container for receiving the cut up molding sand, while only the cutting device is oscil-- lated, a conveyor being associated with the outlet of the receiving container for receiving the molding sand from the receiving container, while magnets adjacent the conveyor are adapted to withdraw iron parts from the molding sand on the conveyor.

4 Claims, 2 Drawing Figures The present invention relates to the crushing of large pieces of molding sand and the separating of residual iron parts therefrom. The invention is based on a device according to which below the feeding means for the large pieces of molding sand there is provided a cutting mechanism adapted to be subjected to oscillations and to crush or cut up the sand pieces, the device furthermore being provided with separating magnets.

With a heretofore known device of the above mentioned type, the cutting mechanism forms an oscillating cross grate comprising bars with cutting edges and adapted to carry out vertical oscillating movements at high frequencies. The grate is arranged on a hollow body or container which receives the crushed material and through the intervention of which the grate is oscillated.

ltis an object of the present invention further to im- 2' mately 1,500 oscillations per minute and with an amplitude offset by approximately from 3 to- 6 millimeters. Of course, also otherdrives are possible, for instance, cam discs, compressed air operated cylinders, or electromagnetic oscillating systems.

As illustrated in FIG. 1, the cutting mechanism 4 will,

in view of its oscillation and the weight of the molding sand pieces 2, work into the latter and cut out there-' for separating or withdrawing any residual iron parts freed from the crushed pieces of molding sand.

The oscillating movements for crushing or cutting up the knocked out large pieces of molding sand are carried out solely by the oscillating grate 4, whereas the prove a device of this kind in order to facilitate the operation of such device and to reduce the costs of operation of such device.

This object and other objects and advantages of the invention will appear more clearly from the following specification in connection with the accompanying drawing, in which:

FIG. 1 diagrammatically illustrates a device according to the present invention.

FIG. 2 illustrates on a larger scale than that of FIG. I a portion of the grate used in FIG. 1.

The device according to the present invention is characterized primarily in that merely the cutting mechanism is oscillated independently of the hollow body or container therebelow which receives the crushed sand pieces. This reduction in the oscillating mass will, particularly in view of the weight of the knocked out pieces of molding sand, bring about a considerable reduction in the energy requirement for the operation of the'oscillating means inasmuch as the drive of the device will be limited to the cutting mechanism. Moreover, the arrangement of a valve or the like on the now stationary container below the oscillating grate for controlling the quantity of the discharged ma terial will be greatly simplified.

Referring now to the drawing in detail, it will be noted that below an open hollow body or funnel 1 for receiving the knocked out large pieces of molding sand 2 there is provided a cutting mechanism 4 in front of the opening of a second hollow body or container 3. The cutting mechanism is designed in the shape of a grate as is more clearly shown in FIG. 2. The transverse and longitudinal bars 5 and 6 respectively of the grate are equipped with roof-shaped cutting edges 7' which are evenly spaced from each other at a right angle. The

cutting edges may be offset as to height as shown in the drawing, or they may also be located in the same plane. In the last mentioned instance, either the transverse cutting edges are located between the longitudinal cutting edges, or vice versa.

The cutting mechanism may be subjected to fast vertical oscillations. To this end, eccentrically journalled rollers 8 may be provided which are adapted to be driven by an electric motor and subject the cutting mechanism 4 to oscillations of a frequency of approxihollow body 3 arranged therebelow does not carry out any movements and advantageously may be employed as stationary intermediate container. From this container the crushed material may be conveyed to a further processing station while the quantity of the material being discharged may be controlled by' an adjustable valve 13 which thus alsomay control the output or throughput of the device.

It is, of course, to be understood that the present invention is, by no means, limited to the particular showing in the drawing but also comprises any modifications within the scope of the appended claims.

What I claim is:

1. An apparatus in combination for crushing and reducing size of large molding sand pieces and separating residual iron parts therefrom, which includesi cutting means for cutting up relatively large molding sand pieces, feeding means having a discharge mouth arranged nearand above said cutting means for feeding molding sand pieces to be crushed to said cutting means, container means arranged below said cutting means for receiving the molding sand from the brokenup molding sand pieces together with residual iron pieces freed therefrom, and actuating means independent of said container means and operatively connected to said cutting mean'sfor orbiting said cutting means in a path between the container means and the feeding means so that sand pieces that are reduced in size are deposited in the container means.

2. An apparatus in combination according to claim 1, in which said cutting means includes a grate with cutting edges arranged crosswise with regard to each other.

3. An apparatus in combination according to claim 2, in which said container means has a discharge opening and which includes variable valve means associated with said discharge opening for controlling the flow of broken-up material therethrough.

4. An apparatus in combination according to claim 3, which includes conveyor means receiving broken-up iron parts from the material on said conveyor means. 

1. An apparatus in combination for crushing and reducing size of large molding sand pieces and separating residual iron parts therefrom, which includes: cutting means for cutting up relatively large molding sand pieces, feeding means having a discharge mouth arranged near and above said cutting means for feeding molding sand pieces to be crushed to said cutting means, container means arranged below said cutting means for receiving the molding sand from the broken-up molding sand pieces together with residual iron pieces freed therefrom, and actuating means independent of said container means and operatively connected to said cutting means for orbiting said cutting means in a path between the container means and the feeding means so that sand pieces that are reduced in size are deposited in the container means.
 2. An apparatus in combination according to claim 1, in which said cutting means includes a grate with cutting edges arranged crosswise with regard to each other.
 3. An apparatus in combination according to claim 2, in which said container means has a discharge opening and which includes variable valve means associated with said discharge opening for controlling the flow of broken-up material therethrough.
 4. An apparatus in combination according to claim 3, which includes conveyor means receiving broken-up molding sand with residual iron parts therein from said discharge opening, and magnetic means for removing iron parts from the material on said conveyor means. 